summaryrefslogtreecommitdiffstats
path: root/Python/sysmodule.c
blob: 5dff38ef793f5281ad59dfa4fb36f9d518801b08 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
/***********************************************************
Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* System module */

/*
Various bits of information used by the interpreter are collected in
module 'sys'.
Function member:
- exit(sts): call (C, POSIX) exit(sts)
Data members:
- stdin, stdout, stderr: standard file objects
- modules: the table of modules (dictionary)
- path: module search path (list of strings)
- argv: script arguments (list of strings)
- ps1, ps2: optional primary and secondary prompts (strings)
*/

#include "allobjects.h"

#include "sysmodule.h"
#include "import.h"
#include "modsupport.h"
#include "osdefs.h"

object *sys_trace, *sys_profile;

static object *sysdict;

object *
sysget(name)
	char *name;
{
	return dictlookup(sysdict, name);
}

FILE *
sysgetfile(name, def)
	char *name;
	FILE *def;
{
	FILE *fp = NULL;
	object *v = sysget(name);
	if (v != NULL && is_fileobject(v))
		fp = getfilefile(v);
	if (fp == NULL)
		fp = def;
	return fp;
}

int
sysset(name, v)
	char *name;
	object *v;
{
	if (v == NULL) {
		if (dictlookup(sysdict, name) == NULL)
			return 0;
		else
			return dictremove(sysdict, name);
	}
	else
		return dictinsert(sysdict, name, v);
}

static object *
sys_exit(self, args)
	object *self;
	object *args;
{
	/* Raise SystemExit so callers may catch it or clean up. */
	err_setval(SystemExit, args);
	return NULL;
}

static object *
sys_settrace(self, args)
	object *self;
	object *args;
{
	if (args == None)
		args = NULL;
	else
		XINCREF(args);
	XDECREF(sys_trace);
	sys_trace = args;
	INCREF(None);
	return None;
}

static object *
sys_setprofile(self, args)
	object *self;
	object *args;
{
	if (args == None)
		args = NULL;
	else
		XINCREF(args);
	XDECREF(sys_profile);
	sys_profile = args;
	INCREF(None);
	return None;
}

#ifdef USE_MALLOPT
/* Link with -lmalloc (or -lmpc) on an SGI */
#include <malloc.h>

static object *
sys_mdebug(self, args)
	object *self;
	object *args;
{
	int flag;
	if (!getargs(args, "i", &flag))
		return NULL;
	mallopt(M_DEBUG, flag);
	INCREF(None);
	return None;
}
#endif /* USE_MALLOPT */

static struct methodlist sys_methods[] = {
	{"exit",	sys_exit},
#ifdef USE_MALLOPT
	{"mdebug",	sys_mdebug},
#endif
	{"setprofile",	sys_setprofile},
	{"settrace",	sys_settrace},
	{NULL,		NULL}		/* sentinel */
};

static object *sysin, *sysout, *syserr;

void
initsys()
{
	extern int fclose PROTO((FILE *));
	extern char version[];
	object *v = newstringobject(version);
	object *m = initmodule("sys", sys_methods);
	sysdict = getmoduledict(m);
	INCREF(sysdict);
	/* NB keep an extra ref to the std files to avoid closing them
	   when the user deletes them */
	sysin = newopenfileobject(stdin, "<stdin>", "r", fclose);
	sysout = newopenfileobject(stdout, "<stdout>", "w", fclose);
	syserr = newopenfileobject(stderr, "<stderr>", "w", fclose);
	if (err_occurred())
		fatal("can't create sys.* objects");
	dictinsert(sysdict, "stdin", sysin);
	dictinsert(sysdict, "stdout", sysout);
	dictinsert(sysdict, "stderr", syserr);
	dictinsert(sysdict, "version", v);
	dictinsert(sysdict, "modules", get_modules());
	if (err_occurred())
		fatal("can't insert sys.* objects in sys dict");
	DECREF(v);
}

static object *
makepathobject(path, delim)
	char *path;
	int delim;
{
	int i, n;
	char *p;
	object *v, *w;
	
	n = 1;
	p = path;
	while ((p = strchr(p, delim)) != NULL) {
		n++;
		p++;
	}
	v = newlistobject(n);
	if (v == NULL)
		return NULL;
	for (i = 0; ; i++) {
		p = strchr(path, delim);
		if (p == NULL)
			p = strchr(path, '\0'); /* End of string */
		w = newsizedstringobject(path, (int) (p - path));
		if (w == NULL) {
			DECREF(v);
			return NULL;
		}
		setlistitem(v, i, w);
		if (*p == '\0')
			break;
		path = p+1;
	}
	return v;
}

void
setpythonpath(path)
	char *path;
{
	object *v;
	if ((v = makepathobject(path, DELIM)) == NULL)
		fatal("can't create sys.path");
	if (sysset("path", v) != 0)
		fatal("can't assign sys.path");
	DECREF(v);
}

static object *
makeargvobject(argc, argv)
	int argc;
	char **argv;
{
	object *av;
	if (argc <= 0 || argv == NULL) {
		/* Ensure at least one (empty) argument is seen */
		static char *empty_argv[1] = {""};
		argv = empty_argv;
		argc = 1;
	}
	av = newlistobject(argc);
	if (av != NULL) {
		int i;
		for (i = 0; i < argc; i++) {
			object *v = newstringobject(argv[i]);
			if (v == NULL) {
				DECREF(av);
				av = NULL;
				break;
			}
			setlistitem(av, i, v);
		}
	}
	return av;
}

void
setpythonargv(argc, argv)
	int argc;
	char **argv;
{
	object *av = makeargvobject(argc, argv);
	if (av == NULL)
		fatal("no mem for sys.argv");
	if (sysset("argv", av) != 0)
		fatal("can't assign sys.argv");
	DECREF(av);
}